Sneak peek. Incorrect boy results?

What’s everyone’s experience with Sneak peek been like? I got my results today and it said boy. Doing my research (after purchasing of course 🤦🏻‍♀️) there seems to be a lot of incorrect boy results! I live with my husband and son at home so contamination was likely but I tried to be very thorough in ensuring that didn’t happen. Just how easy is contamination?